Attaching categories from one table to entries in another MySQL

Question

I have a database which takes user submitted data, the entries from which I want to group under one or several of about 10 categories.

So for example, you add your entr

Answer 1

To get a business data with all categories you can do,

SELECT bus.*, cat.category_name FROM business bus 
    JOIN tbl_works_categories twc USING (bus_id) 
    JOIN categories cat USING (category_id) 
    WHERE bus.bus_id = ?

To retrieve business data from category name, just switch the WHERE param

SELECT bus.*, cat.category_name FROM business bus 
    JOIN tbl_works_categories twc USING (bus_id) 
    JOIN categories cat USING (category_id) 
    WHERE cat.category_name = ?